The extend size is the minimum size by which a chunk in this space can be automatically extended.

扩展大小是该空间中一个块可自动扩展的最小分配大小。

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Only unmirrored dbspaces and temporary dbspaces can have a non-zero extend size, because chunks cannot be extended in any other type of space.

只有未镜像的 dbspaces 和临时 dbspaces 可以有一个非零 extend size，因为不能在任何其他类型的空间中扩展块。

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Extend size - this the minimum allocation size by which a chunk in this space can be automatically extended.

extend size -这是空间中可自动扩展的块的最小分配大小。

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